This timepiece is limited to 1500 pieces and is inspired by the original design of the iconic Big Pilot’s Watch Calibre 52 T.S.C. The bronze case takes on a slight patina and gets darker with time, giving the watch a charm all of its own. While pure copper is relatively soft, the high-tech bronze alloy used by IWC contains aluminium, which makes it harder and more rigid. Bronze, which is also used for the conical crown, is wear resistant and extremely durable. A soft-iron inner case protects the movement against the effects of magnetic fields. The IWC-manufactured 52110-calibre has a Pellaton automatic winding system with parts made from black or white ceramic. It builds up a power reserve of 7 days in two barrels. The leather strap is divided into two sections that are sewn together at the ends, preventing it from being dropped when the wearer is putting it on. The brown calfskin strap further underscores the heritage character of this timekeeper.